[Email Security] Update text add-ons

[Maddy-Cloudflare]

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PR Change Summary

Updated the documentation for configuring text add-ons in Email Security, enhancing clarity and detail.

• Revised instructions for configuring subject and body prefixes.
• Added advanced settings options for dynamic labels and threat types.
• Clarified the steps for saving configurations.

Modified Files

• src/content/docs/cloudflare-one/email-security/detection-settings/configure-text-add-ons.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/cloudflare-one/	@ranbel, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://8c694b6d.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-email-security-pcx-18376.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/email-security/detection-settings/configure-text-add-ons/	https://maddy-email-security-pcx-18376.preview.developers.cloudflare.com/cloudflare-one/email-security/detection-settings/configure-text-add-ons/